are made? >> reporter: komo 4 in seattle. >> abc's great made in america christmas challenge. komo 4 is joining "world news." >> reporter: they've been on the hunt, too. this store, nube green. >> these are elf booties. >> reporter: where it's not just the booties, just about everything, made in america. wzzm. >> as part of our great michigan christmas. >> reporter: and in south bend, indiana, wbnd finding a pen maker. and with their help, he's now selling his made in america pens to the world. >> going to china and japan instead of the other way around. >> reporter: and it turns out this made in america conversation has taken off elsewhere, too. so many americans going on twitter, and for the first time, a tally. since we started this journey, 946,565 tweets with those three words, made in america. "world news" viewers, a huge part of that. like samantha. just tweeted me, "did a little christmas shopping today for some friends, and the best part? all of it was #madeinamerica." and she sent me the picture to prove it. and who noticed this conversation? one of the founders of twitter.